Stages in barnyardgrass and watergrass development and herbicide timing for most effective control. Check other figures for times when these materials are least likely to damage rice.

Notes:
Propanil and Thiobencarb require a permit from your county agricultural commissioner.
 
If propanil is used earlier than this, water must be lowered to expose foliage. Rice may be injured prior to filtering if conditions are not correct.

Illustration from Integrated Pest Management for Rice. UC ANR Publication 3280.